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2 SheetsShCeL 1.

C. G. PERKINS.

INCANDBSCENT ELECTRIC LAMP AND SWITCH.

(No Model) N0. 287,313. Patented OCt. 23, 1883.

INVENTCR AT T vEST-VI (No Model.) 2 Sheets-Sheet 2.

C. G. PERKINS.

INC'ANDESCENT ELECTRIC LAMP AND SWITCH.

No. 287,313. Patented Got. 23, 1883.

ATTESTI INVENT (3F11` TM/MMM I Zr @Us c1/g.

UNITED STATES CHARLES G. PERKINS, OF HOBOKEN, NEIV JERSEY, ASSIGNOII IMPERIAL ELECTRIC LIGHT COMPANY, OF NEVY YORK, N.

PATENT OFFICE..

'IO THE INCANDESCENT ELECTRIC LAMP AND SWITCH.

SPECIFICATION forming part of Letters Patent No. 287,313, dated October Application filed January l0, 1853. (No model.)

To all whom t may concern:

Be it known that I, CHAs. G. PERKINS, a vcitizen of thefUnited States, and .a resident of Hoboken, in the county of. Hudson and State vwill make it impossible to form an electrical connection on the exterior thereof.

.The first part of my invention consists of an electric ineandescentlamp having an opening in thek wall of its neck, through which plastc rof -paris is poured for the purpose of holding the electrical conductors in position, and also for .holding suitable means therein in suchI a manner-.as will hold the lamp rigid to a switch-box made therefor.

The second part of my invention consists of a glassswitch-box dividedintotwo apartments, the. l.upper apartment connected with the lower apartment bylneans of a hinge. l apartment is provided with a central metallic tappvhich is held in position by means of plasterof.paris, in which cavities are made for the reception of springs having metallic plates connected therewith, each of which is electrically connected with, the main conductors of the lamp. The uppcrglass apartment is provided with two annular grooves on the top thereof, each of which receives a corresponding metallic w i th the under side thereof. One of the plates representsthe positive pole, while the other represents the negative.

The third part of my invention consists of mounting an armor on the cut-out wire,'which is passed into a tube of insulating material. The whole is then passed into r which is held rigid to the top ofthe glass chamber. The tin vwire is electrically connected with theannular plate representingr the positive'pole.V The lower end of the tin wire is broughtinto electrical contact with the mctallicplate of thelowcr senting the positive pole.

The lower plate having springs connectedy glass chamber, reprethe switclrspring. Fig. The fourth part of my invention consists of having an upright screw placed on the center of the top of the upper glass chamber. The said screw is provided with a shank which passes down and through the body of the gla top, and then through two metallic strips, one of which is electrically connected with the annularmetalli'e plate representing the negative pole ofthe lamp. The second metallic strip is provided with a projection extending dow nward, to which is fastened a circular plate of vulcanized fiber or other insulating material. Therother side of the insulating-plate is provided'with a simicircular metallic plate electrically connected with the metallic strip h5' means of metallic pins. lhc insulated plate is providcdiwith an incline arising from its Surface, offof which aswitclrspringsnaps onto the semicircular plate. At the other end of the semicircular plate the switch-sp ri ng snaps down into a' depression made in the said insulated plate.

The fifth part of my invent-ion consists of a metallic strip the uppermost end of which is provided with a foot which rests against t-he under side of the glass top of the switch-box.

The said metallic strip is also provided with an aperture, through which the pin holding` the switch-spring passes, thus forming a perfect electrical connection at that point.r The lower end ofthe aforesaid metallic strip is provided with an enlargement thereon, which rests against the metallic plate of the lower glass chamber,representing the negative pole 0f the lamp.

In the drawings, Figure I represents a vertical section ofthe lamp and switch-box.v Fig. 2 represents a plan of the top of the switchbox, showing the annular grooves. Fig. 3 represents al plan of thc lower chamber of the switch-box. Fig. ltreprcsents a plan and ele vationy ofthe metallic plates, with springs at tached to the under side thereof. Fig. 5 represents vertical section of the tubes containing the cut-outwirc therein. Fig. 6 represents a front elevation of the circular plate of vulcanized fiber, showing the semicircular metallic plate and its support in dotted lines. In this figure is also shown a front elevation of 7 represents the lamp Vand switch-box coi'nplete and part-ly raised on globe of box, having two annular groovcs, 3 and 4, on

the top thereof.

G is the lower apartment ofthe glass switchbox, filled with .plaster-of-paris D', which is provided with cavlties 25 therein, for keeping lIlIl Iliesition the metallic plates and springs I is the central lnetallic tap, whichv is also held in position by the plaster-of-paris.- The said tap I receives the screw of the gas-pipe.

K is the hinge on which the upper apartment swings.

L L' are the metallic plates, provided with springs 5 and 6, riveted to theunder side thereof. The said plates L L' are held in position by small pins 7, which extend from the plate through the glass, and are bent over, so as to keep them in a fixed position whenever the Lamp shall have been removed from the switch- M is the cut-out wire, passing into an insulating-tube, N, which also passes into a metallic tube, O, provided with pins S, which pass up and through the glass top of the switchbox, and are bent over, sons to hold the same in a vertical position. The upper end of the cutout wire M is electrically connected with the positive plate L, while thelower end is brought in electrical contact with the positive plate H whenever the switch-box shall have been closed. The lower end of the insulated tube N projects a little below the metallic tube O, which prevents the latter from coming in contact with the plate H.

I is the upright metallic screw, having its shank passing` down and through the center of the top of the glass switch-box. The said shank passes through two metallic strips, 9 and 10, the first of which is electrically connected with the negative plate L. The said strip 9 is also electrically connected with the strip 10, the two being held tightly together by a screw-nut, 12, of the shank. The extension 13 of the strip 10 supports a circular plate, R, of vulcanized fiber or other suitable material, by means of metallic pins which extend therefrom through the circular plate R, and thence through a metallic plate, S, of a Semicircular forni, which is electrically connected with the metallic strip 10 by means of the aforesaid metallic pills.

T is the switch-key, mounted ou a metallic stem having a head on the end thereo f. The said stem passes through the eye U of the switchspring V, and thence through the upright metallic strip 14, provided with a foot, 15, which rests against the under side of the top of the switch-box. The lower end of said strip 14 is provided with an enlargement on the end thereof, which is brought into electrical contact with the plate H' whenever the switch-box shall have been closed. The strip 14 and switch-spring V are kept in a constant electrical contact by means of j ain-nuts 22.

The face of the plate R is provided with an incline, 16, upon which the springV slides, and from which it snaps to the plate S. Whenever the said spring V shall have been moved to the other end of the plate S, it will then snap from the surface thereof .down into th-e depression 17, made in the plate R.

Modus operamli.-After the lamp and switchbox have been properly made, the screwnut E is screwed on the upright screw P until the conductors 1 and 2 press heavily upon the plates L and L', which give way under pressure, and offer a resistance by means of the .springs 5 and 6, after which the electrical conductors of the lamp will make a perfect electrical contact with the switch-box. The switchbox F is then closed and held to the lower chamber, G, by means of acatch-spring. This operation brings the cut-out wire M in contact with the plate H, having connected therewith a retracting-spring which insures a perfeet electrical contact with the said cut-out wire. The enlarged end of the upright strip 14 is also brought into contact with the plate H'. The said plates H and H' are electrically connected with the main conductors a. and b, which pass through the gas-pipe C. The current of electricity passes up the main conductor a to the plate H, from which it passes to the cut-out wire Mto the plate L; from thence to the conductor 1 to the carbon filament of the lamp, from which it passes to the conductor 2 to the plate L', from thence to the strip 9, to the strip 10, down its extension 13, from which it passes through the metallic pins to the plate S' then to the spring V to the upright stripl14, thence downward t0 the plate H', and fr m thence to the main conductor b,

`which completes the circuit.

Heretofore the electrical conductors of incandescent lamps passed from the interior of the vaccuous chamber to the exterior, and were bent out and upward, so as to tit snugly to the neck of the lamp, in which shape it is mounted on a switch-box made of rubber or fiber. Said conductors come in contact with metallic plates, strips, or wires fastened to said switch-box, and rep rcsentin g the negative and positive poles ofthe lamp. This construetion of a switch-box made of rubber or fiber is objectionable, from the fact that the heat of the electrical conductors and the neck of the globe produces great damage to the electrical connections by causing the rubber or fiber to warp and corrode, thus breaking the circuit audagain causing the switch-handle to become inoperative. It is also objectionable, from the fact that the rubber or fiber are very zoby my expensive materials anddiicu'lt to work into I F, having proper shape, thus proving ment to their introduction into public use.

These objections have been demonstrated by 5 practical experience, and are obviated by my glass switch-box, which surpasses all others for durability and chcapness. It docs not corrode or warp; hence its great advantage over thoscheretofore mentioned.

:I am aware that plaster-of-pars has heretofore been used on the exterior of the neck of anelectric incandeseentlamp. -I am also aware that cntouts have also been used in conneca great impedip, tion with switch-boxes of anincandescent 15 lamp;

but-they were not supplied with n. prop- Y er armor that would insure a positive action, or that would prevent an electric circuit from "being forniedo'n theexterior of the switch- These objections, however, are obviated glass switch-box, as heretofore de` scribed.

Having thus described my in venti0n,'\vhat I claim as'ncw, and desire to secure by Lcttersi Patent, is-

l. In- .any electric incandescent lamp, Ywith the neck of theglobc having Aan aperture in the well thereof, the cond uctors therein in con Y tact with the circuitccnnection in the top of the switch-box, and held in suitable position- 30 by the plaster-of-paris filling in the neck.

2. Thecombination, substantially as shown and described, of the conductors 1 and 2, seiten-'- nut E, plaster-of-paris D, all of 'which are -Y placed in the interior .of Ythe neel; B Aof the 35 globe A., and the opening C in the wall of said neck B, through which the plaster-otparis D is pourcdl 3. In an electric incnndcscentlamp,asnitch` box made of glass and divided into two apart f 4o me nts,` the upper apartment provided with annnlar grooves to receive the circuit-connectionsxin combination with the lower apartment filled with plaster-of-paris for holding suitable means in position therein 'which will make a 45 perfect electrical contact wi th theswtch mechanism of the upper apartment 'when mounted thereon.

4. In an incandescentlamp, the glass switchp box described, consisting of upper apartment,

annular grooves 3 and apartment, G, with plastcr-of-paris D, and inclosed circuit-conncctions, substantially as sot forth.

5. The combination, substantially :1s shonn and dcscribcthof the plaster-oli paris D', sprl ngsupported plates H H', tap I, and apartments F and G, with an electric incandescent lamp.

6. The metallic plntcsl, L', springs 5 and (i,A and glass apartments F and G, in combination with the conductors of an electric incandescent 6c lamp, substantially as Shown and described.

7. The cut-outwi re M, insulated tube N, metallic tube O, and studs 8, in combination vwith plntcs L L and glass apartments F and G of aswitch-box for an electric incandescent lamp, 6 5 substantially ns shown and described.

S. The combination of the upriglltscrcw P, metallic strips 9 and 1l), extension 13, insulated plate R, and metallic plate S, in combination. with metallic plates L L of a switch-box for 7o an electric incandescent lmnp, substantially as shown and described.

9. The 1metallic strip 14, with foot on the upper end thereof, in combination with a switch-spring, V, key T, metallic pin 17, jain- .7 5 nuts 22, and glass partitions F and G of a glass switch-box for an electric incandescent lmnp, substantially ns shown and described.

10.v In `an electric incandescent lamp, the combination of the screw-nut E, held in post 8o tion within the wnlls of tlncneck B byplastcrv ofpnris D, and the conductois l and 2, held therein in the same manner, in combination with the upright screw l. strips El 1l), exten sion 13, insulated plate R, metallic plate S, grooves 3 and 4, plates L L', cnt-out Wire M, insulated tube N, mctallictubc O, switchspring V, upright strip 14, pin 1S, jam-nuts 22, spring-plates H H', plaster-of-paris D, tap I, glass apartments F G, and hinge K, snb stantinlly as shown andjdescribcd.

Signed at New York, in the county of New York and State of New York, this 10th day of January, A. D. 1SS3.

` CHARLES G. PERKINS.

"itncsscsz Grao. R. PrroEnUs, Jona' Hennes-FELD.

ll, lower 5o 

